A good-natured lab assistant becomes the caretaker of a young girl, who one night is randomly left in his apartment by her father, for reasons unknown to him.
Anna and Simon move to Eskilstuna. Where Simon falls in love with Ingrid, married to Kurre. Ingrid and Simon's affair is soon discovered. It wrecks both marriages.
When office clerk "Harry Lund" wakes up in his car after a night of gambling, he finds a dead man in the seat next to him, stabbed by Harry's own paper knife. Harry has no choice but to find the real culprits - whoever they are.
